Corda Flow Tester

WHAT IT DOES

Corda Flow Tester provides comprehensive testing and simulation capabilities for Corda flows. It reads and displays flow source code input with full Kotlin/Java support, compilation status indicating successful parsing, error messages with detailed descriptions, warning messages highlighting potential issues, flow execution results showing the final output, execution trace tracking step-by-step flow progress, variable state for all flow variables, call stack for method invocation tracking, flow state transitions showing state machine progression, participant node states for all involved parties, transaction building logs showing transaction construction, signature collection status for required signers, notary validation results for uniqueness checking, transaction finalization status for completion, flow progress tracking with percentage complete, step-by-step execution logs for detailed debugging, transaction creation logs for audit, contract verification results for validation, ledger state queries for data access, vault state for UTXO tracking, transaction history for previous transactions, flow session state for communication channels, message exchange logs for inter-party communication, flow start event for initiation, flow end event for completion, attachment processing results for document handling, oracle query results for external data, current block information for context, and transaction ID for reference. All data is organized in a clean dashboard with flow execution visualization, transaction building details, and comprehensive logging.

HOW TO USE

Enter your Corda flow source code in the input area (Kotlin-style). Specify input parameters as a comma-separated list. Click "Run Flow Test" to start the simulation. The tool will parse and validate the flow source, then simulate execution through all flow steps including transaction building, signing, notary validation, and finalization. Results are displayed in organized cards showing compilation status, flow steps, signature status, notary validation, finalization status, transaction ID, and participant nodes. The flow execution log provides detailed step-by-step logs. The transaction building log shows transaction construction details. The tool works with any Corda flow that follows standard Corda Kotlin/Java syntax and flow structure.

THE MECHANISM

Corda Flow Tester performs client-side simulation of Corda flow execution. The tool first parses the source code to identify flow annotations (@StartableByRPC, @InitiatingFlow), flow class structure, and flow logic. It validates the syntax and checks for required Corda framework elements. During simulation, the tool creates a virtual flow execution environment that mimics the Corda node runtime. It simulates vault queries by creating mock state objects, builds transactions by adding output states, commands, and attachments, collects signatures from simulated participants, sends transactions to a simulated notary, and finalizes transactions. The tool tracks all flow steps including state transitions, variable changes, and message exchanges. Execution traces are generated by recording each flow step with detailed information about the operation being performed. Transaction building logs capture all transaction construction steps. The tool simulates contract verification by checking simple validation rules and provides status feedback.

WHAT IT CANNOT SEE

Corda Flow Tester cannot execute Corda flows on-chain to verify behavior against actual Corda network state, as it uses simulation rather than real node execution. The tool cannot detect runtime errors that only occur when executed in the actual Corda node environment, as simulation may not replicate all network conditions. It cannot verify that the flow logic is secure or free from vulnerabilities without formal verification. The tool cannot guarantee that the simulated flow will behave identically when deployed to different Corda versions or network configurations. It cannot predict actual transaction fees accurately without on-chain context. The tool also cannot detect issues that only manifest under specific network conditions or with particular counterparties.

PLEASE NOTE

Corda Flow Tester supports EVM-compatible chains only. The tool is a client-side simulation and does not execute or deploy code to any blockchain. Simulation results are for development and testing purposes only — always test flows thoroughly on test networks before production deployment. The tool is free to use and does not store or transmit any flow code or simulation results off-device. Always review execution logs and transaction building details carefully before relying on simulation results.